stiochiometry

WAMAP
11/15/22, 3:26 PM
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Stoichiometry
15 points possible
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Question 1
5 pts
3
Questio
Results Part A: Reaction Stoichiometry of Sodium Bicarbonate with Acetic Acid.
Enter the results for Part A, based on the masses determined in the lab video for Part A. Although your
data may not be rounded, round the answers for the results below to the appropriate number of
significant figures.
Trial 1
mass of CO2
gas released
moles of CO2
gas released
moles of CO2
gas, corrected
for amount
dissolved
moles of
NaHCO3 used
Trial 2
Trial 3
g
g
g
mol
mol
mol
mol
mol
mol
mol
mol
mol
Using the results above, select the reaction that best described the chemical reaction between sodium
bicarbonate and acetic acid.
NaHCO3(s) + HC2H3O2(aq) → 2 CO2(g) + CH3OH(aq) + NaH(aq)
NaHCO3(s) + HC2H3O2(aq) → CO2(g) + H2O(l) + NaC2H3O2(aq)
2 NaHCO3(s) + HC2H3O2(aq) → CO2(g) + Na2CO3(aq) + H2O(l) + 2 CH2O(aq)
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11/15/22, 3:26 PM
Question 2
6 pts
3
Questio
Results Part B: Analysis of an Antacid
Enter the results for Part B, based on the masses determined in the lab video for Part B. Round all
answers below to 2 significant figures. (Trial 2 produced only one significant figure, but we will use 2
sig figs in this section.)
Trial 1
mass of CO2 gas
released
moles of CO2 gas
released
moles of CO2 gas,
corrected for amount
dissolved
Experimental moles of
NaHCO3
Experimental mass of
NaHCO3
Trial 2
g
g
mol
mol
mol
mol
mol
mol
g
g
Average mass of NaHCO3 for two tablets:
g
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Question 3
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1 pt
3
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11/15/22, 3:26 PM
Describe how your data in Part A supports your conclusion about the appropriate reaction in Part A.
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Questio
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Question 4
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2 pts
3
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11/15/22, 3:26 PM
Questio
In Part B, suppose some of your reaction mixture splashed out of the beaker when you dropped the
tablets into the acetic acid. How would this affect your measurements? Be as specific as possible.
How would the splashing error affect the amount of CO2 determined, and consequently, would your
final calculated mass of sodium bicarbonate in the tablet be artificially high or artificially low?
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Question 5
1 pt
3
To calculate the percent error, use the mass of sodium bicarbonate in one tablet of Alka-Seltzer recorded
from the package for the true value and your average mass of NaHCO3 for the experimental value.
(Show 1 significant figure)
% error =
Questio
|truevalue − exp erimentalvalue|
∗ 100 %
truevalue
%
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